CASPER. CASPER 1 YO child human FE model CHILD ADVANCED SAFETY PROJECT FOR EUROPEAN ROADS

Transcription

1 CHILD ADVANCED SAFETY PROJECT FOR EUROPEAN ROADS 1 YO child human FE model Jikuang Yang Chalmers University of Technology SAFER-Vehicle Traffic Safety Center Co-workers: Sunan Huang (Chalmers) Frank Meryer, Remy Willinger UDS-University of Strasbourg) COVER WORKSHOP in TUB - BERLIN Germany, 13 March, 2012

2 WP2: Child human body modelling 1 YO child human FE modelling Objective Development of 1 year old child (1YOC) human model to be used in virtual simulations for investigations of accidentology, injury biomechanics, injury tolerances, and evaluation of effectiveness of protective devices. ORGANISATION CHALMERS Jikuang Yang WP 2

3 WP2: Child human body modelling Outline of tasks carried out by Chalmers and UDS FE meshing of 1YO child FE model head/neck (UDS) Others: limbs, thorax, pelvis, etc (Chalmers) Coupling of the model (UDS) Positioning of the 1YO child model (Chalmers) Evaluation of the segment models Head impact by simulation domestic accidents (UDS) long bones in condition of three point bending (Chalmers) Thorax in frontal impact (Chalmers) Evaluation of the 1YO child model Global response in passenger car crash environment (Chalmers/UDS) ORGANISATION CHALMERS Speaker Jikuang YANG WP N 2

4 WP2: Child human body modelling The geometry and mechanical property data The geometry data of 1YO child was based on digitized image data from LMU The mechanical property data were based on literature and scaling from adult data ORGANISATION CHALMERS Speaker Jikuang YANG WP N 2

5 Head 1 YOC Fontanelle Outer/Inner table Hypothesis : symmetric model Falx Face Segmentation of the External / Internal skull and mandibular bones Tentorium Positioning the two membranes ORGANISATION UdS Rémy WILLINGER WP N 2

6 Head (1 YOC) Falx Brain Tentorium Fontanelle Skull CSF Face ORGANISATION UdS Rémy WILLINGER WP N 2

7 Head (1 YOC) 1 YOC Head model elements Number of elements used for the 1YOC head meshing Shell Brick Falx 323 Tentorium 440 Brain CSF Skull+sutures Face 544 Scalp TOTAL ORGANISATION UdS Rémy WILLINGER WP N 2

8 Neck (1 YOC) 1 2 UdS Segmentation based on LMU data Segmentation of each cervical vertebrae. Special attention to the facet joint 3 Cervical spine geometry reconstruction ORGANISATION UdS Rémy WILLINGER WP N 2

9 Neck (1 YOC) ORGANISATION UdS Rémy WILLINGER WP N 2

10 Neck (1 YOC) Number of elements used for the 1YOC neck meshing Shell Brick Spring Vertebrae Disks Ligaments 555 TOTAL elements ORGANISATION UdS Rémy WILLINGER WP N 2

11 Head-Neck coupling (1 YOC) Capsular ligament Occipito-atloidien anterior Flavum ligament Ligament posterior ORGANISATION UdS Rémy WILLINGER WP N 2

12 Head-Neck coupling (1 YOC) Shell Brick Spring Head Neck TOTAL YOC UdS Head-Neck model elements ORGANISATION UdS Rémy WILLINGER WP N 2

13 WP2: Child human body modelling Segment development of 1YOC long bones, spine, rib cage, pelvis, femurs, tibias, etc CHALMERS The skeleton of the whole child body is presented in one geometry figure in left. All the segments were meshed by solid elements. The remeshed model was shown in right, total element number 54,931, and node number 73,220. Original geometry ORGANISATION CHALMERS Speaker Jikuang YANG WP N 2 Front view

14 WP2: Child human body modelling Segment development of 1YOC skin and soft tissue CHALMERS The skin model of the 1YO child was meshed by using quadrilateral elements, the total element number 3,901, and node number is 3,819. The skin was also meshed by using triangle elements with total element number 7,283, and node number 3,697. ORGANISATION CHALMERS Speaker Jikuang YANG WP N 2

15 WP2: Human Body Modelling Coupling of 1YO child model STRASBOURG ORGANISATION UDS Speaker Jikuang YANG WP 2

16 WP2: Human Body Modelling Coupling of 1YO child model STRASBOURG ORGANISATION UDS Speaker Jikuang YANG WP 2

17 WP2: Human Body Modelling Positioning by using TUB 1YO child seat CHALMERS ORGANISATION CHALMERS Speaker Jikuang YANG WP 2

18 WP2: Human Body Modelling Measuring of 1YO child model positioning in TUB seat model CHALMERS ORGANISATION CHALMERS Speaker Jikuang YANG WP 2

19 19 WP2: Child human body modelling Simulation of head impact in domestic accidents Strasbourg 1 YOC 6 Cases 3 Fractures 0 SDH 0 DAI 3 No injury ORGANISATION UdS Rémy WILLINGER WP N 2

20 20 Head (1 YOC) : accident simulation WP2: Child human body modelling Simulation of head impact in domestic accidents using Q1- FEM-simulation CASE : -19 Strasbourg Age: 10 MOC Sexe: Female Height: 0.7 m Impact Zone: Left Frontal Head Surface: Tiling Injury: None [g] HIC=2687 ORGANISATION UdS Rémy WILLINGER WP N 2

21 21 Head (1 YOC) WP2: Child human body modelling 1 YOC-HEAD Simulation of head impact in domestic accidents using 1YOC FE head Accident simulations CASE : -19 Strasbourg Age: 10 MOC Sexe: Female Height: 0.7 m Impact Zone: Left Frontal Head Surface: Tiling Injury: None SKULL SKULL [Energy] BRAIN Brain VM Stress VM=52 Kpa Brain Pressure Pmin= -657 Kpa Pmax= 1756 Kpa 4589MJ Brain Pressure No skull failure ORGANISATION UdS Rémy WILLINGER WP N 2

22 WP2: Child human body modelling Evaluation of long bones CHALMERS Tibia in three point bending Simulation of long bone three point bending based published study by Ouyang et. al, (2003) 0 ms 10 ms 14 ms ORGANISATION CHALMERS Speaker Jikuang YANG WP

23 WP2: Child human body modelling Femur in three point bending CHALMERS 0 ms 20 ms 24 ms ORGANISATION CHALMERS Speaker Jikuang YANG WP

24 WP2: Child human body modelling Evaluation of long bones in three point bending CHALMERS Comparison with adult tibia three point bending response ORGANISATION CHALMERS Speaker Jikuang YANG WP

25 25 Thorax-Abdomen 6 Y.O. validation WP2: Child Human Body Modeling Evaluation of 1YOC thorax in frontal impact CHALMERS Simulation of thorax impact based published study by Ouyang et. al, (2006) 1YOC-f-impact.avi Response rather stiff Needs for adjustments of soft tissue material properties, ORGANISATION CHALMERS Jikuang Yang WP 2

26 26 Thorax-Abdomen 6 Y.O. validation WP2: Child Human Body Modeling Evaluation of 1YOC thorax in frontal impact CHALMERS Simulation of thorax impact based published study by Ouyang et. al, (2006) Response rather stiff Needs for adjustments of soft tissue material properties, 1YOC-f-impact-left.avi ORGANISATION CHALMERS Jikuang Yang WP 2

27 WP2: Child human body modelling ORGANISATION CHALMERS Speaker Jikuang YANG WP

28 Ackowledgements - European Commission - partners ORGANISATION CHALMERS Speaker Jikuang YANG WP 2

29 Thanks for your attention! ORGANISATION CHALMERS Speaker Jikuang YANG WP 2